| .. -*- coding: utf-8; mode: rst -*- |
| |
| .. _video_fopen: |
| |
| ================ |
| dvb video open() |
| ================ |
| |
| Name |
| ---- |
| |
| dvb video open() |
| |
| |
| Synopsis |
| -------- |
| |
| .. cpp:function:: int open(const char *deviceName, int flags) |
| |
| |
| Arguments |
| --------- |
| |
| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
| |
| |
| - .. row 1 |
| |
| - const char \*deviceName |
| |
| - Name of specific video device. |
| |
| - .. row 2 |
| |
| - int flags |
| |
| - A bit-wise OR of the following flags: |
| |
| - .. row 3 |
| |
| - |
| - O_RDONLY read-only access |
| |
| - .. row 4 |
| |
| - |
| - O_RDWR read/write access |
| |
| - .. row 5 |
| |
| - |
| - O_NONBLOCK open in non-blocking mode |
| |
| - .. row 6 |
| |
| - |
| - (blocking mode is the default) |
| |
| |
| Description |
| ----------- |
| |
| This system call opens a named video device (e.g. |
| /dev/dvb/adapter0/video0) for subsequent use. |
| |
| When an open() call has succeeded, the device will be ready for use. The |
| significance of blocking or non-blocking mode is described in the |
| documentation for functions where there is a difference. It does not |
| affect the semantics of the open() call itself. A device opened in |
| blocking mode can later be put into non-blocking mode (and vice versa) |
| using the F_SETFL command of the fcntl system call. This is a standard |
| system call, documented in the Linux manual page for fcntl. Only one |
| user can open the Video Device in O_RDWR mode. All other attempts to |
| open the device in this mode will fail, and an error-code will be |
| returned. If the Video Device is opened in O_RDONLY mode, the only |
| ioctl call that can be used is VIDEO_GET_STATUS. All other call will |
| return an error code. |
| |
| |
| Return Value |
| ------------ |
| |
| .. tabularcolumns:: |p{2.5cm}|p{15.0cm}| |
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| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
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| |
| - .. row 1 |
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| - ``ENODEV`` |
| |
| - Device driver not loaded/available. |
| |
| - .. row 2 |
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| - ``EINTERNAL`` |
| |
| - Internal error. |
| |
| - .. row 3 |
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| - ``EBUSY`` |
| |
| - Device or resource busy. |
| |
| - .. row 4 |
| |
| - ``EINVAL`` |
| |
| - Invalid argument. |
